Bump org.jetbrains.kotlin:kotlin-bom from 2.0.10 to 2.0.21

Bumps [org.jetbrains.kotlin:kotlin-bom](https://github.com/JetBrains/kotlin) from 2.0.10 to 2.0.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.10...v2.0.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

digiwf-task/pom.xml

@@ -16,7 +16,7 @@
     <description>Task management used by DigiWF</description>
 
     <properties>
-        <kotlin.version>2.0.10</kotlin.version>
+        <kotlin.version>2.0.21</kotlin.version>
         <camunda.version>7.21.0</camunda.version>
         <polyflow.version>4.2.0</polyflow.version>
         <camunda-bpm-data.version>1.5.0</camunda-bpm-data.version>